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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

See Explanation. Moving the cursor over the image will bring up an alternate version. Clicking on the image will bring up the highest resolution version available.See Explanation. Moving the cursor over the image will bring up an alternate version. Clicking on the image will bring up the highest resolution version available.

Stars and Mars

Explanation: Wandering through the evening sky , on May 4th planet Mars stood in line with Castor and Pollux, the two bright stars of the constellation Gemini . In this time exposure of the celestial alignment, Mars actually takes on a distinct yellowish hue, contrasting in color with Pollux ; a giant star known to have a Jupiter-class planet , and Castor ; itself a multiple star system. Though in mythology Pollux and Castor are twin brothers, the two stars are physically unrelated and are about 34 and 50 light-years distant respectively. Included in the skyview are Procyon , alpha star of Canis Minor , and famous star cluster M44 also known as the Beehive Cluster . Dust in our own solar system reflecting sunlight creates the faint band of Zodiacal light emerging from the lower right corner of the frame. Just put your cursor over the picture for help with identifications. Of course, bright Mars can still be found in the western evening skies and tonight wanders near the crescent Moon.

Date May 10, 2008
Credit Credit & Copyright: Doug Zubenel ( TWAN )
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.